21-3t=6

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Solution for 21-3t=6 equation: 



21-3t=6

We move all terms to the left:

21-3t-(6)=0

We add all the numbers together, and all the variables

-3t+15=0

We move all terms containing t to the left, all other terms to the right

-3t=-15

t=-15/-3

t=+5

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